Twin-light plug



June s, 1928. 1,672,664

0. H. VAN AMBURG TWIN LIGHT PLUG Filed Nov. 21, 1922 Jim/enter- 3 Otto H. VanAmbur-g, W 2 His Attorney 4 Patented June 5 1928.

UNITED STATES PATENT OFFICE.

OTTO H. VAN AMBURG, OF BRIDGEPORT, CONNECTICUTQ'ASSIGNOR T0 GENERAL ELEC- TRIC COMPANY,

A CORPORATION OF NEW YORK.

Twin-LIGHT PLUG.

Application filed November 21, 1922. 7 Serial No. 602,424.

The present invention relates to electric current distribution and more particularlyto twin light plugs whereby an ordinary single lamp socket is adapted to function with two lamps or one lamp and a tap off circuit as for a flat iron, toaster, etc.

The object of my invention is to provide an improved twin lamp plug which shall be hardy and reliable in service, and ofsimple and economical construction.

One embodiment of the invention is shown in the accompanying drawing, in which Fig.

1 is a part side elevation and part section of the plug; Fig. 2 is'a fragmentary end elevation thereof, and Fig. 3 is a perspective view of a detail. a

The main frame or base of the twinlight plug is of molded porcelain or compound and made in two like parts 1 and 2 with plane meeting surfaces which are held together as a unit by a central transverse screw 3. On opposite sides of the transverse screw the base is formed at its lower edge with plain cylindrical recesses 4, the axes of which are in the dividing plane, for the reception of the lamp engaging screw shells 5 disposed at an angle to each other and with the wall between their inner ends cut away at 6 and having in their end walls 7 rectangular mortises 8 for the reception of U-shaped bridge pieces 9 of holding yokes or anchors 10.

The screw shells 5 have inturnedflanges 11 at their inner ends provided with radial shoulders 12 formed by cutting away the inner edges of the flanges so as to fit the ends of the. U-shaped bridge pieces -9 which in turn fit in the mortises 8. The outwardly bent ends of the yokes 10 are made crescentshaped and overlie the flanges 11 of the shells so that when the yokes are held in place the shells are positively anchored against displacement both axially or angularly with respect to the base.

The upper edge of the base is provided with a circular seat 14 for the reception of the inturned flange 15 of a plug shell 16 and I v in which flange are formed two ears 17 for the reception of screws 18 and 19 which have threaded engagement with the bridge pieces 9 and by means of which the several screw shells are bound or clamped to the base and electrically connected to each other.

An insulating core block 20 is mounted within the plug shell 16 and carries at its upper end a. center contact washer 21. A connecting bolt or screw 22 passes through the washer21, the core block 20 and the base and screwed home in a tapped hole in a bar 23 1 by Letters Patent of the United States, is,-

1 A twin lamp plug comprising an insulating base provided at its lower edge with 'two cylindrical recesses with mortises in their respective end walls and at its upper edge with a seat, screw shells located in said cylindrical recesses and having flanges engaging the end walls of saidrecesses, a plug screw shell having a flange engaging said seat, holding yokes engaging the flanges oi the screw shells in said recesses and having bridge pieces extending into said mortises, and connecting means between the flange of the plug screwshell and said bridge pieces, whereby said shells are electrically connected and mechanically anchored to said base.

2. A twin lamp plug comprising an insulating base provided at its lower edge with two recesses with polygonal mortises in their respective end Walls and at its upper edge with a seat, lamp receiving screw shells located in saidrecesses and having inturned flanges engaging the end walls of said re cesses and provided with shoulders, a plug screw shell having an inturned flange engaging said seat, holding yokes overlying the flanges of saidlamp receiving shells and having U-shaped bridge: pieces engaging the shoulders thereof and the sides of said mortises, "and screws electrically and mechanically connecting the flange of said plug shell with said bridge pieces.

3. A twin lamp plug comprising an insulating base provided at its lower edge with two connecting recesses with mortises formed in their respective end walls and at its upper edge with a seat, lamp receiving screwshells located in said recesses and pro- Vided with inturned flanges engaging the end Walls of said recesses, anchors connected to said screw shells and extending into said mortises, a plug shell contactengaging said seat and connected to said bridge pieces, an

insulating block located Within said plug- 7 sl1ell,: a common center; contact bar locatediet the inner ends of said recesses, and a c0nnect-ing bolt extendlng through said nsulating block into engagement with said Contact 10 bar.

In Witness whereof, I have hereunto set my hand this 16th day of November, 1922.

OJILTO -VAN AMBURG. 

